Algolia-powered realtime search

Hey guys/@PeterDaveHello,

Following up on https://github.com/cdnjs/cdnjs/pull/4078#issuecomment-65888765, I've added an Algolia-powered searchbar to the cdnjs.com website. Let me know if you like it!

![realtime search](http://g.recordit.co/ouGcK8wrxZ.gif)

PS: I'll then share with you the Algolia.com credentials + add some [DSN](http://www.algolia.com/dsn) locations.